The article you posted refers to roster limit meaning that, theoretically, a team could carry 30 players right now if they so desired. The reason you rarely, if ever see this (untilthe playoffs, when it is commonplace) is because all those extra players would be receiving salary and counting against the cap. This is just my interpretation of the rule, it's not something I would have otherwise expected. That said, I am pretty sure it refers to something separate from the call-up issue anyways.
Here is the relevant portion of the CBA pertaining to post-deadline call-ups:
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The first fragment of the first sentence refers, in complicated but precise terms, to the Trade Deadline. Subsection (i) spells out the rule I am wondering about, given that Summers is not with a club of any league affiliated with the NHL (or, I believe, on our Reserve List).
This article elaborates quite thoroughly on the issue but only references NCAA in the final sentence. They seem to imply that NCAA and CHL players are exempt from that rule, but they might be subject to different regulations.